Call data recording telephone system



Dec. 25, 1951 R. E. HERSEY CALI.. DATA RECORDING TELEPHONE SYSTEM 9 Sheets-Sheet l Filed Dec. 16r 1947 /NVE/vroR .HERSEY vl B ATTORNEY Det'. 25, 19571 4 R. E. HERSEY 2,580,093

CALL DATA RECORDING TELEPHONE SYSTEM Filed Dec. 16, 1947 9 sheets-Sheet 2 k@ wm- Il H N a wl /M/EA/rof? RE HERSE Y ATTORNEY Dec. 25, 1951 R. E. HERsEY 2,580,093

CALL. DATA RECORDING TELEPHONE SYSTEM Filed Deo. 16, 1947 9 Sheets-Sheet 3 Dec. 25, 1951 R. E. HERSEY 2,580,093

CALL DATA RECORDING TELEPHONESYSTEM Filed Dec. 16, 1947 9 sheets-sheet 5 I 1 f f 1 1 "Q @MG-@Ew- HERSEY ATTORNEY Dec.. 25, 1951 2,580,093

R.E.HRSEY CALL DATA RECORDING TELEPHONE SYSTEM Filed Dec. 16; 1947 9 Sheeis-Sheet 6 /NvE/vof? RE HERSEY Dec. 2s, 1951 y RE. HERSEY 2,580,093

i Uluzl ATTORNEY Dec. 25, 1951 R. E.- HERSEY 2,580,093

CALL DATA RECORDING TELEPHONE SYSTEM Filed Dec; 1e, 1947 9 sheets-sheet ,s

REERSEY. BY

ATTORNEY De@ 25, 19;.51 y R. E. HERSEY 2,580,093

CALL DATA RECORDING TELEPHONE SYSTEM Filed Dec. 16, 1947 v 9 sheets-sheet 9 T0 T/MEE C/ECU/T /A/VENTOR R. .HL-RSE BY ATTORNEY Patented Dec. 25, 1951 UNITED s'rA'rEs .assorti Mem" OFFICE CALL DATA RECORDING TELEPHONE SYSTE Ralph E. Hersey, Madison, N. J., assignor to Bell Telephone Laboratories,

Incorporated, New

York, N. Y., a corporation of New York Application December 16, 1947, Serial No.f792,046

9 Claims.

ignation of the station called is ordinarily registered in a. sender, but means must be provided for identifying the calling line and for transmitting said identification, as well as the designation of the station called, to a recording dej vice. The times of answer and disconnect cannot, of course, be recorded until those events occur, and these records must be accompanied by some indication, such as an identication of the calling line, that will enable them to be associated with the call to which they relate.

The present invention discloses a novel system in which the calling line is identified, whenever identification is required for the record, and the designation of the called station is obtained for recording, by time-spaced electrical impulses.

A feature of the invention is the common impulsing equipment for obtaining for recording purposes both the designation of the calling line and the designation of the called line.

Another feature of the invention is the use of a register responsive to said common impulsing equipment which has a digitalr registering capacity of less than the total number of digits to be registered and subsequently recorded, thus reducing the quantity of equipment ordinarily used for such purpose. i

Another feature of the invention is the use of a common recorder for recording information in connection with all calls serially on a common medium. j

These and other features of the invention will be more apparent from the accompanying description, the appended claims, and the drawing, in which:

Fig. 1 shows line circuits and switches for eX- tending calling lines;

Fig. 2 shows the common impulse device;

Fig. 3 shows a portion of a district junctor circuit;

Figs. 4 and 7 show the circuits of the impulse connector;

Figs. 5 and 6 show the register switches of the sender;

Fig. 8 shows register circuits and an associated -commutator which, in the present embodiment 2 of the invention, is part of the impulse device shown in Fig. 2;

Fig. 9 shows the circuits of the recordenand Fig. 1'0 shows how the above figures should be placed in relation to one another to completely disclose the invention.

In this invetnion, time-spaced impulsesrv are used to indicate the digits to be recorded, and each digit is represented by two of five possible successive impulses, in accordance with the following code:

Impulses of group of five The digits so represented are recorded by correspondingly-spaced depressions punched in a paper tape by a suitable recorder, the circuits of which are shown in Fig. 9. For a more complete understanding of the construction and operation of a recorder of this type, reference may be had to the copending application of W. W. Carpenter, Serial No. 588,401 led April 14, 1945.

In the present embodiment of the invention, timespaced impulses are produced by the impulser shown in Fig. 2. This device comprises eleven cams CMQ CMH) mounted on a common shaft and continuously rotated by motor M. Each of the ten cams CMU CMS is assigned to the indication of a particular digit, for example, cam CMO for digit 0, cam CMI for digit 1, etc. Each cam has two projections thereon at two of five possible positions for said projections, corresponding to the code, as given above, for the digit to which the cam is assigned, and five equally-spaced sets of contacts responsive to said projections. For example, cam CMO, assigned to the digit 0. has two projections 5U and 5i so spaced thereon that, as said cam rotates and said projections encounter the No. 4 contacts of said cam, said contacts are twice closed at periods corresponding to the fourth and fifth periods of closure of any of the No. 4 contacts of cams CMQ CM9. Similarly, as the projections 5!) and 5| pass the No. 5 contacts of cam CMO said contacts are closed at the fourth and fifth periods of closure of the No. 5 contacts of cams CMS) CMS. A similar eiiect is produced at the No. 1, No. 2 and No. 3 contacts of said cam. Each of the cams CMI CM is similarly arranged in accordance with the code of the digit to which said cam is assigned. Cam CMI has one projection thereon, which, as said cam rotates, closes the No. 1 contacts of said cam just before any of the No. 1 contacts of cams CMU CMQ close, and closes the No. 2 contacts of cam CMH] just before any of the No. 2 contacts of cams CMQ CMQ close, etc.

Each o1" the conductors which is grounded by the closure of contacts of cams CM1! CMQ, such as conductor 52, for example, is provided with a rectifier RCU poled to permit passage of negative potential to said contacts, but to oppose passage of positive potential.

In accordance with the present invention, a conductor of each subscribers line, which may be the conductor ordinarily used to control a message register, is connected to conductors grounded by closure of contacts of cams CMl CMS in accordance with a distinguishing designation of said line, which may be, for example, the directory number of said line. In the present illustration,l the directory numberof the line of station A is assumed to be 78610. Conductor 53 of said line is therefore connected through rectifier RC to conductor 54, which is the conductor grounded by closure of No. 1 contacts of cam CM1, in accordance with the first digit 7 of said directory number. Conductor 53 is also connected through rectifier R013 tc conductor 55, which is the conductor grounded by the No. 2 contacts of cam CMB, in accordance with the second .digit 8 of said directory number. Likewise, conductor 53 is connected through rectifiers R026,` RC3I, and RCM) respectively, to conductors 55, 5l, and 58 in accordance with the last three digits 610 of the directory number and thence to contacts 3, 4 and 5, respectively, o the appropriate numerical cams.

While in -the present embodiment of the invention, provision is made for line designations of ve digits, it is obvious that connections may be made. for any line, in the manner described above, for `a designation of less than ve digits and that, by obvious expansion of the arrangements shown, provision may be made fondesignations of more than veY digits.

The commutator CM is shown in Fig. 8 for convenience but is associated with the impulser of Fig. 2, and its arm AM is continuously rotated by motor M. Said arm is so adjusted that it engages. the No. 1 segment of said commutator when the No. 1 contacts of cam CMN are closed by the projection of said cam. The number of segments required in commutator CM depends upon the maximum number of digits requiredV to be controlled by said commutator. In the present embodiment of the invention, provision is made for controlling five digits through said commutator. It will be obvious that by suitable arrangement of the circuits and equipment, provision may be made for controlling more or less than live digits by said commutator.

For a clear understanding of the invention, the operations in connection with a call from station A will be described. When a call is originated by the removal of the receiver at station A, the line of said station is extended in the usual manner by switches Sl and S2 to a district junctor circuit, for example, the circuit part of which is shown in Fig. 3, and is connected to a sender in which the called number vdialed. at station A is registered. The construction and operation of suitable circuits for performing these operations are so well known that it is not thought necessary to disclose them here nor to describe their operations in detail, reference may be had to the patent to W. W. Carpenter 2,235,803 dated March 18, 1241, for a more complete description of suitable circuits and apparatus forthis portion of the system. When the calling line A has been extended to the district junctor, relay S operates over a circuit extending from battery through the lower winding of said relay, conductor 5B, No. 2 contacts of switch S2, No. 2 contacts of switch Si, switchhook contacts of station A, No; l contacts of switch Si, No. 1 contacts of switch S2, conductor 6l, and upper winding of relay S to ground. When relay STL of the sender operates in the usual manner at the completion of dialing, relay PST operates over a circuit extending from battery through the winding of said relay, arm and No. 1 terminal of bank No. 2 of switch SW, conductor 59 within bracket TB and contacts of relay STL to ground. Relay PLQ, associated with the district junctor circuit of Fig. 3, then operates over a circuit extending from battery through contacts oltrelay LI, upper winding of relay P L; conductor 62, and No. 2 contacts of'relay PST to ground, and locks up over a circuit extendingv from battery through thewindingofrelay Ll, No. 31 front contacts and lowerwinding of relay PLS), conductor 62, and No. 2 contacts of ,relay PST to ground, over which circuit relay Ll also operates. Operation of relay LI prevents the operation of any of relays PLI PLii associated with other district junctor circuits. Relay SLi) operates over a circuit extending from battery through contacts of relay L2, upper winding of,

relay SLU, conductor y63, No. 30 contacts of relay PLU, conductor 64, and No. l contacts of relay PST to ground and locks up. over a circuit extending from battery through the winding of relay L2, No. 3 front contacts and lower winding of relay SLU to the sameground, over which circuit relay L2 also operates. Operation of relay L2 prevents the operation of relaysY SLI SLS associated with other senders district junctors.

When, now, the projection on cam CMl closes one of the contacts of said cam, for example. the No. 5 `contacts, the varm AM of commutator CM will be on the No. 25 segment of said commutator and a circuit is completed from `battery through the winding of relay SIG, No. 25 segment and arm AM of commutator CM, conductor 55,l contacts of relay NO, No. 2 contactsofrelay SLU, conductor 65, No. 20 contacts of relayk PLO., conductor 6l, back contacts Vof relay` MTR, conductor 68 with bracket-,10, rectier RCX, conductor 'i, and No. 5 contacts of cam CM1-0 to ground, over which relay' SIG operatesand locks up through its No. 1 ycontacts and backcontacts of relay RTC to ground. RelayAA then operates over a circuit extending from battery throughthe windingand No. 2- normal contacts of said relay, No. 3 back contacts o relayBA, conductor 72, No. 2 `front contacts of relay SIG, conductor 13, and No.l 4 contacts of relay SLB to ground, and locks up through its No. 2 front con` tacts and conductor 13 to the same ground.

Switches A, B, C, TH, H, T, U, and ST are the cross bar type` register switches of the 4sender by which ,the dialing at station A is registered in the well-known manner. Assuming, for example, that the number dialed is 123456711v it is CMG. The digit registered by relays EI would then be 0 since the contacts of cam CMB registered by the closure of the No. 1 contacts of switch A, the No. 2 contacts of switch B, the No.

`3 contacts of switch C, the No; 4 contacts of switch TH, the No. 5 contacts of switch H, the No. 6 contacts of switch T, the No. 7 contacts of switch U, and the No. l contacts of switch ST. For a more complete description of the registration in this manner of the number dial from the calling station, reference may be had to the above-mentioned patent to Carpenter. When the arm AM of commutator CM now reaches the No. 26 segment of said commutator, the No. `5 contacts of cam CMI .are closed by one of the projections on said cam. A circuit is thereby completed from battery through the winding of relay EI, No. 26 segment and arm AM of commutator CM, conductor 65, contacts of relay NO, No. 2 contacts of relay SLU, conductor 66, No. 2-0 contacts of relay PLU, conductor 61, back contacts of relay MTR, conductor 68 within bracket 1B, rectifier RCD, No. 4 back contacts of relay TR, No. 1 contacts of switch ST, conductor I4 Within brackets I5 and 16, and No. 5 contacts of cam CMI to ground, over which relay EI operates and locks up through its No. l contacts and back contacts of relay RTC to ground. When the arm AM of commutator CM reaches the No. 27 segment of said commutator, the No. 5 contacts of cam CMI are likewise closed. Relay E2 then operates over a circuit extending from battery through the winding of said relay, No. 27 segment and arm AM of commutator .CM and the circuit traced above, to ground and locks up through its No. 1 contacts and back contacts of relay RTC to ground. When the arm AM of lcommutator CM reaches the No. 28 segment, the No. 5 contacts of cam CMI are not closed and no circuit is completed either through said contacts or through other register switches and contacts of other cams, since the contacts of said other register switches are connected only to No; 1 No. 4 contacts of cams CMS CMS, none of which contacts are'closed at thi time. Likewise when the arm AM of commutator CM reaches the No. 29 and No. 30 segments, no circuits. are closed. By the above operation, relays EI and E2 are operated and locked up. These relays, the rst and second relays of the group of relays El E5, correspond, according to the code previously given, to the digit "1 which is thereby registered as the last digit tion, no digit would have been registered by i switch ST and the hold magnet STH of said switch would not be operated. A circuit would then be completed from conductor $8 through rectier RCD, No. 4 back contacts of relay TR, contacts to hold magnet STH, and conductor 58 within bracket 'I6 to the No. 5 contacts of cam E5 close in positions corresponding, in accordance with the code given above, to saiddigit. The

` digit zero lin this position indicates that the :of commutator CM, conductor 55, contacts of .relay N0, No. 2 contacts of relay SLU, conductor -I6, No. 20. contactsof Vrelay PLD, conductorrfl,

contacts of relay MTR, 4conductor 68 within bracket 10, rectier RCE, No.5 back contacts of relay TR, No. 4 contacts of switch TH, conductor TI within brackets 'i8 and 80, and No. 1 contacts of cam CMII, which are closed at this time, to ground, over which relay AI operates` and locks up through its No.1 contacts and back contacts of relay RTC to ground. When the arm AM of commutator CM passes the No. 2 and No. 3 segments, no circuits are closed. When said arm reaches the No. 4 segment, however, the No. 1 contacts of cam CMA are closed and a circuit is completed from battery through the wind.- ing of relay A4, No. 4 segment and arm AM of commutator CM, thence, over the circuit traced above, to ground, over which relay A4 operates and locks up through its No. 1 contacts and back contacts of relay RTC to ground. Relays AI and A4 operated register, in accordance with the code previously." given, the digit 4 as the fourth digit dialed at station A.

In like manner, as the arm AM of commutator CM continues to rotate, relays B2 and B4 are operated and locked up to register the fth digit 5 dialed at station A and registered by switch H. .Relays C3, C4, DI, and D5 are similarly op` erated and locked up to register the sixth and seventh digits 67 dialed at station A and registered by switches T and U, respectively. By the operation of the above-mentioned register relays, a circuit is completed from battery through the winding of relay NO, conductor 8|, No. 4 contacts of relay D5, No. 2 contacts of relay DI, No. 4 contacts of relay Ei, No. 2 contacts of relay E2, No. 4 contacts of relay C3, No. 2 contacts of relay Cli, No. 3 contacts of relay B2, No. 2 contacts of relay B4, No. 4 contacts of relay A4, and No. 2 contacts of relay AI to ground, over which relay NO operates, opening the previously-traced circuit through commutator CM. Relay MC operates over a circuit extending from battery through the winding of said relay, No. 1 contacts of relay BA, No. l contacts of relay AA and conductor 8|, thence, over the circuit traced above for relay NO, to ground. .The circuits of relays NO and MC will not be completed, said relays will not operate, and the impulse circuit through commutator CM will remain eiective unless or until two relays of each of the groups AI A5, BI ...135, CI....C5, DI ..,D5, and EI E5 are operated, as described above.

When relay MC operates, punch magnets vMI M28 of the recorder operate in accordance with the register relays operated. For example, punch magnet M4 operates over a circuit extending from battery through the winding of said magnet, No. 22 contacts of relay MC, conductor 82, No. 1 contacts of relay AI, and back contacts of relay RTC to ground. The combination of punch magnets so operated corresponds to the combination of register relays operated which, as described above, corresponds to the digits 45671 dialed at station A. Said operated punch magnets punch in the tape T of the ref corder al corresponding. arrangement of holes or depressions, thereby recording said digits. Punch -rnagnet MI is also operated over a circuit extending from battery through the winding of said magnet, No. 4 contactsof relay AA, and No, 4 contacts of relay BA to ground, punching a single hole which indicates that additional associated information is to be recorded on another line of the tape of the recorder.

When relay MC operates, the stepping magnet .STP of the recorder operates over a circuitexatacgosa 7 tending from battery through the. winding of. said magnet and No.- 27 contacts. of relay MC to ground, but performs no function at this time. A circuit is. also completedr frombattery through the. winding of relay RTC, conductor 83, and. No. 21 contacts. of relay MC to ground. Relay-RTC operates over said circuit. but is slowto operate so that its operation is delayedy untilafter the punch magnets have operated. Operation of relay RTC opens the locking circuits of the operatedregister relays and relay SIG,y releasing said relays which, in turn, release the. operated punch magnets (except magnet Ml), and relay NO. A circuit is also completed from battery through. the.V winding of. the stepping magnet STPR of sWitchSW, conductor 8d, No.. 10 contacts of relay PLD, conductor 85, No. l contactsof relay SLO, conductor 86, and front contacts of relay RTC to ground over which said stepping magnetl operates, moving the arms of switch SW to the No. 2 terminals. Relay TR then operates over. a..circuit extending from'battery through' the winding of said relay, conductor 81 Within bracket 10, and No. 2` terminal. and arm voi bank No. 2 of switch SW to ground.

Upon the release of relay SIG, as described above, relayV BA operates over a circuit extending from battery through the Winding and No. 2.nor;^ mal contacts of said relay, No. 3 .contacts of relay AA, conductor` 88, No. 2 back contacts of relay SIG, conductor 13, andNo. 4- contactv or y relay SL-J to ground, and locks up through its No. 2 iront contacts to the same ground. The No. l vcontacts of relay BA open the circuit of and release relay MC and the No.4 contacts of relay BA open the circuit of and releasepunch magnet MI'. The No. 2'7 contacts of relay MC open the circuit of and vrelease the stepping magnet STP 'of the recorder, which, in releasing, moves the recorder tape T to a position for punching a new line.

magnet STPR of switch SW.

By the release of relay NO, the impulse circuit, previously traced through commutator Clf, again becomes effective and, during a revolution of the arm AM of saidcommutator, registerrelays are operated and locked' up in the manner previously described. However, by the operation TR, register switches A, B, and'C are now included in said circuit in the order named, instead of register switches TH, lei, T, U, and ST while the digit 0 is arbitrarily added aftery the. digit C in the'fourth and fifth digital orders to fill up the five digital registers, it being. understood that if the number being registered is composed. ofV less than ve digits the differencewill be supplied by zeros. The combination of relays AI A5 op erated and locked up is, therefore, that representing the digit 1, which is the. first. digit dialed at station A and registeredv by switch A. Likewise, the combination ofrelays BI B5 operated and locked up corresponds tothe second digit 2 dialed at station A which isl registered by switch B, and the combination of relays CI C5 operated and locked up corresponds to the third digit 3 dialed at stationfAWhich is registered by switch C.

In the case of register switch TH, a circuit is completed from conductor 68 through rectifier RCE and No. 5 front contacts of relay TR to conductor 90 within bracket;16;which gives the same eiect as if the No. 0 contacts of switch .TH were closed.v Thecombinationr of YrelaysDl vD5 operated land locked up; therefore, corresponds to thek digit :0. Likewise, a circuit is completed fromA conductor 68 through rectifier /RCD and No. 4. front contacts of relay TR to conductor 58 withinbracket 'I6 which'gives thesame'eiect asl if the No. O'contacts `of switchSTWere closed. The combination of relay El E5 operated and locked up, therefore, corresponds to the vdigit fO.

Relay SIG also 'operates over. the circuit previ? ously traced and relay AB operatesover av cire.- cuit iextending; from. battery through the winding and No. 2 normal contacts of said relay, No.` 3 contacts of relay BB,.No. 3 front contacts offrelay BA,. conductor '12, No. 2 .front contactspof relay SIG, conductor 13, and No. 4 contactsl of relay SL22. to ground and locks up 'through its No. 2 front contacts tothe same ground. Relay MC operates overa circuit extending from battery through the winding of said relay, No. 1 conf tacts of'relay BB, No. 1 contacts of relayv AB, conductor 8l, and contacts of the operated register relays to ground. The operated register relays then cause the operation of corresponding punch magnets of the recorder to record the digits 12309, in the manner previously described. The rst three of these digits are the first three digits dialed at station A. Taken in conjunction withthe rst line recorded, there has now'been recorded allthe digits dialed at station A which, of course, constitute the designation of the called station. Punch magneti/II also operates over a circuit extending from battery through the winding of said magnet, No. 4 contacts of relay AB, and No. 4 contacts oi relay BB to ground recording a characterto indicate that the present recorded line. forms part of an entry containing more than one line. The operation of relays RTC and: NO and the stepping magnet STP takes place as previously described, releasing the operated register relays, the operated punch magnets, and relay SIG. Upon the vrelease of thev latter relay, relay BB operates over a circuit extending from battery through the winding and No. 2 normal contacts of said relay, No. 3 contacts of relay AB, conductor 88, No. 2 back contacts of relay SIG, conductor .13, and No. 4 contacts of relay 'SLOto ground and locks up through its No. 2 front contacts to the same ground. The No. l contacts of relay BB open thecircuit of and release relay MC, releasing, in turn, relays RTC and NO and the stepping magnet STP which moves the tape Tof the recorder to a position for punching a new line.

Bythe operation of relay RTC, as described above, a circuitl is completed from battery through the winding of the stepping magnet STPR of switch SW, conductor'd, No. 10 contacts of relay PLQ, conductor S5, No. l contacts of relay SL, conductor 85, andfront contacts Aof relay RTC to ground over which said stepping magnet operates, moving the arms of switch SW to the No. 3- terrninals. Relay MTR then operates, over anv obvious circuit. Stepping magnet STPR reieases when relay RTC releases, as

described above.

-contacts of'relay MTR, `:conductor 92, No. 4

contacts ofV switches S2 and Si, conductor 53, and rectiiiers RC?, RClS, RCZS, RCSI, and RCM to contacts of the impulser. Upon rotation of the arm AM of commutator CM, comhinations'of Tfr register relays are again operated in the manner described above, but these combinations are now in accordance with the connections between conductor 53 and the contacts of the impulser which connections are, as previously described, made in accordance with the designation of the line of station A, and the register relays operated represent the digits 78610. The operated register rrelays cause the operation of corresponding punch magnets of the recorder in the manner already described and the designation 78610 of the calling line is thereby recorded. Now, however, punch magnet M3 operates over a circuit extending from battery through the winding of said magnet, No. 5 contacts of relay BB, No. 5 front contacts of relay BA, and No. 1 contacts of relay MC' to ground, punching a character which indicates that the present recorded line is the last line of the entry.

When relay RTC operates, stepping magnet S'IPR of switch SW operates over the circuit previously traced, moving the arms of switch SW to the No. 4 terminals. The circuit of relay PST is thereby opened and said relay released, opening the circuits of and releasing relays PL!) and SLD. Relays Ll and L2 are also released but these relays are slow to release and prevent operation of any of the relays PLil PLS and SLU SLS until relays PLQ and SL53 are fully released. Stepping magnet STPR releases when relay RTC releases and by the operation and release of relay RTC, stepping magnet STP oi the recorder is operated and released, moving the tape T of the recorder to a position for punching a new line. By the release of relay SLB, the locking circuits of relays AA, BA, AB, and BB are opened and said relays released. The recorder is now free to be-used for recording by other district junctors in the manner described above or in other ways, connection of said recorder to said junctors being made by the operation of relays PLI PLQ and SL! SLS.

When the called subscriber answers and the charge relay CH of the district junctor circuit operates in the usual manner, relay PST operates over a circuit extending from battery through the winding of said relay, arm and No. Llterminal of bank No. 2 of switch SW, and No. 3 contacts of relay CH to ground, causing the operation of relays PL!) and SL13, in the manner previously described. Upon rotation of the arm AM of commutator CM, relay MTR being still operated,registervrelays are again operated in combination corresponding to the designation 78610 of the calling line. However, by the operation of relay MTR, the circuit of relay SIG, is opened andsaid latter relay does not now operate. This prevents the operation of relays AA and MC. Relay TC operates over a circuit extending from battery through the winding of said relay, No. 5 contacts of relay AA, No. 2 back contacts of relay RCH, and contacts of operated register relays in series to ground. Relay TC connects conductors from a timer circuit of any suitable well-known type to windings of the punch magnets of the recorder. A combination of'said punch magnets corresponding to the conductors grounded by said timing circuit at the momentin accordance with the current time is thereby operated to record digits representing said current time. Punch magnet Ml also operates over an obvious circuit through No. 2 contacts of relay TC to ground, punching, as before, a character to indicate that the present recorded line forms part of an entry of more than one line. .Stepping magnet STP operates fit) over an obvious circuit through No. 26 contacts of relay TC to ground. Relay RCH operates over a circuit extending from battery through the winding and No. 1 normal contacts of said relay, and No. 1 contacts of relay TC to ground and locks up through its No. 1 front contacts, conductor 8 l, and contacts of the operated register relays in series to ground, opening the circuit of and releasing relay TC which, in turn, releases the operated punch magnets. Relay RCH is made slow to operate to give time for the punch magnets to operate. Release of relay TC opens the circuit of and releases stepping magnetSTP' which moves the tape T of the recorder to a position for punching another line.

Relay MC now operates over a circuit extending from battery through the winding of said relay, No. 2 front contacts of relay RCH, conductor 8|, and contacts of the operated register relays in series to ground, connecting the punch magnets of the recorder to the register relays. Combinations of punch magnets corresponding to the operated register relays and, therefore, to the designation 78610 of the calling line, are thereby operated to record said designation. Punch magnet M2 also operates over a circuit extending from battery through the winding of said magnet, No. 6 contacts of relay BB, No. 5 back contacts of relay BA, and No. 1 contacts of relay MC to ground, recording a character which indcates that the recorded information relates to the answer of the called subscriber. Upon the operation of relay RTC, the operated register relays and punch magnets and relay MC are released, as previously described, and stepping magnet STPR of switch SW operates over the circuit previously traced, moving the armsof switch SW to the No. 5 terminals. The circuit of relay PST is thereby opened and said relay released, releasing, in turn, relays PLO and SLU. Operation and release of the stepping magnet STP moves the tape T of the recorder to a position for punching another line. The recorder is now free to be used by other district junctors.

When the receiver is restored at station A at the completion of the conversation, the circuit of relay Sis thereby opened and said relay released. When relay Sl is also released in the usual manner either by the called subscriber or by the usual timed-release circuit, relay PST operates over a circuit extending from battery through the winding of said relay, arm and No. 5

terminal of bank No. 2 of switch SW, No. 1 contacts of relay CH, No. 2 contacts of relay SI, and back contacts of relay S to ground, again operating relays PLI) and SLS in the manner previously described. A repetition of the operations describedabove in connection with the answer of the called subscriber then takes place,

y recording again the current time on one line and the designation 78610 of the calling line on a second line. When relay RTC operates, stepping magnet STPR of switch SW again operates, moving the arms of switch SW to the No. 6 terminafs. The release magnet REL of switch SW then operates over an obvious circuit, returning the arms ofv switch SW to the No. 1 terminals. The circuits are then4 free for similar operations in connection with other calls.

By the operations described above, the essential information in regard to the call, comprising in one entry the designation of the called station and the designation of the calling line, in another entry, the time of answer of the called subscriber and the designation of the'calling line,

and in a third entry, the timeof disconnect and the. designation ofthe calling line, is recorded. Thethree entries may be associatedby the designation ofthe callingline appearing in` each. Itwill beY understood that a callfrom any other station through any-other district junctor and with any other sender of thel-systemfwillbe similarly recorded by the recorder and associated equipment shown.

The contacts CT are closed whenever the arms of `switch SW are not on. the No. 1 terminals. In the caserof a call abandoned beforethe answer of. the called subscriber, relay CH will not be operated andcontacts4 CT will be closed. Then, when relay S is released by restoring the receiver at the calling station, the release magnet RELof switch` SW operates over a circuit extendingfroinbat'tery through the winding of said magnet, contacts-CT, No. 4 contacts ofrrelay CH, andback. contacts of relay S to ground, restoring the arms .of switch SW to the No. 1 terminals. The sender. being disconnectedat` this time, all operatedrelays are released and further recordingin connection with said .call prevented.

What is .claimed is:v

1.` Ina telephone system, in combinationwith a calledfline and a callingline each having a numerical. designation.. composed of a number of digits, asender settable to Vregister the numerical designation: of, said caled. line, an` impulser producing. time-spacedimpulses connectedto said calling line in accordance with its numerical designation and tosaid sender, aregister having a digital registering capacity less than thetotal number ofsaid digitsrand repetitively operable byesaid.V impulser. to register Athe digits of said called-.line designation under the control of said sender, andthe digits of. said calling line designation. under the control of said calling line con.- neetion,.and; a recorder responsive to the operations of. said: register for. recording insuccession. the .digits` of said called line-designation and the digitsof said calling line designation.y

2. In a-telephone system, incombinationwith acallingline--and a called line eachhavingan individual designation composed of digits, a sender,v an impulser producing time-spacedlimf pulses, connections between. said impulser, said sender andI said` calling line, theoonnection. between: said.. impulser; andY saidcalling line being inaccordance with .the latterfs Vindividual designation, a register having. a.v digital :registering capacity of less than the *totalnumberrofA said digits; means responsive toA the. registration; of

said called line designationrinf. said sender-for operating.y said.-,register under thecontrol of v said impulser, thereby Jo-register the designationof said .-calledline. therein, a recorder,v meansvresponsivevk to the operation of said register for operating saidrecorder to record saidicalled line designation, means Vlreffective subsequent to the operation of said recorder for discharging said register. andforapplying a'potential to the connection.` between said calling line and saidA impulser, therebyto'freoperate said register -under the :control of saidimpulser to-registersaid call-fing-linedesignationr therein, and means responsive'- toY the.A last-mentioned operation of said register for reoperating said recorder to record theedesignation of" said callingv line.

Ina-telephone system, incombination with aecallingfline'and a called lineeachhaving an individual designation composed` of' digits, a sender, an :impulser-.producing time-spaced impulses-,. connections-between. said, impulser, said sender. andsaidicalling line, the. .connection bei: tween said impulser and` saidY calling, line.` being in accordance withy the` latters individual desigf,v nation, a register having a digital registeringcapacity of.V less thanthe total number of.V said digits, a single conductor connectable. between said register and said impulser, means responsive to the registration of said called line designation in said sender for operating said` register under the control ofsaid impulser and-over .saidsingle conductor to register the designationy of said called line, a recorder, means responsive tothe operation of said register for operating saidref corder to record said called line designation, means effective subsequent to theoperation` of said recorder for dischargingsaid registerand for applying a potential. to. the connection between said calling line and said-impulser, thereby. to reoperate said register` under the controlof said impulserY and over said single; conductor. to register said'callingfline designation, andY means responsive tothe last-mentioned operationofsaidi registerV for reoperating said V,recorderto record the designation ofi saidl calling jlinel Y 4'. In a telephone-system,,inzcombination vwith a calling line havingk a numerical designation consisting of a number of digits, a called line having a numerical designation consisting of the. same or diferent number ofA digits designating the oice in which said line is located andthe same or different number 'of dig-its ldesignating the directory number of said. line in said oiiice,V a sender settable to register the numerical des--l ignation of said called" line, an impulser prov ducing time-spaced impulses connected to said calling line in.v accordance with itsnumerical.- designationand'to said sender, a register having a registering capacity equal, to the maximum numberv of digits in any onerof said numbers and repetitivelyy operable by said impulser to. register under the control of said sender the digits of the number designating saidcalled office and the digits designating' thev directory number of said"calle`d line,v and to register under. the control of said callingline connection the digitsl constituting the numerical designation of said calling line, and ay recorder responsiveto each operation ofl said register-for recording on` different portions of the. recordingmediumtheY direc.-A tory number of said calledzline. and an arbitrary character,l the called office number and the same arbitrary character, and the callingdine` number and a different arbitrary character.

5. In a telephone system, incombinationfwithA a calling line having aV numerical designationconsisting of a number of"di`gits, a called line:

having a numerical designation consisting ofthe'- same or different number of digits designating the oice in which said called line islocated and the same or diiTerent number oi""digits desigfI nating the directory numberof saidcalled vline in said called oiiice, a sender settable to registerthe numerical designationl of said called line, an impulser producing time-spaced impulses connected to said calling line Yin 'accordancewith itsY numerical designation and tosaid sender, a register having a registering capacityr equal to the Vmaximum number of fdigits inany one:V of. said numbers and repetitive'lyv operable.:by said impulser to `register under'the control ofsaid sender the digits Yof the number designating said called oillce and the `digits designating theY directory number Vof said called line therein, and to register underfthe control of said calling line:V

connection` .the digits constituting ,the .numerical designation of said calling line, and a recorder responsive to each operation of said register for recording in succession and on diierent portions of the recording medium the directory number of said called line and an arbitrary character, the called o'ce number of said called line and the same arbitrary character, and the calling line number and a diierent arbitrary character.

6. In a telephone system, in combination with a calling line and a called line each having an individual designation composed of a number of digits, ymeans for establishing and terminating a connection between said lines, a sender settable to register the designation oi said called line, an impulser producing time-spaced impulses connected to said calling line in accordance with its individual designation and to said sender, a register having a digital registering capacity of less than the total number of said digits and repetitively operable under the control of said impulser to register said called line designation registered in said sender and to register said calling line designation over said calling line connection, a recorder responsive to each operation of said register for recording said called line designation, a timer, means responsive to the establishment of said connection, means responsive to said last-mentioned means for reoperating said register under the control of said impulser and over said calling line connection to register said calling line designation, means responsive to the last-mentioned operation of said register for establishing a connection from said recorder to said register and from said recorder to said timer, thereby to operate said recorder from said register to record said calling line designation and .from said timer to record the time when said connection was established, means responsive to the termination of said connection, and means responsive to said last-mentioned means for reoperating said register under the control of said impulser and over said calling line connection to register said calling line designation, and to reestablish said connection between, said recorder and said register and said recorder and said timer, thereby to reoperate said recorder from said register to record said calling line designation and from said timer to record the time when said connection was terminated.

'7. In a telephone system, in combination with a calling line and a called line each having an individual designation composed of digits, a sender settable to register the designation of said called line, an impulser connected to said calling line in accordance with the individual designation thereof and to said sender, said impulser being capable of producing coded series of impulses, each of said coded series of impulses representing a digit, and a register having a digital registering capacity of less than the total number of digits in the designation of both said calling line and said called line, said register being operable by said coded series of impulses to register in succession the digits of said called line designation and the digits of said calling line designation.

8. In a telephone system, in combination with a calling line and a called line each having an individual designation composed of digits, a sender settable to register the designation of said called line, an impulser connected to said calling line in accordance with the individual designation thereof and to said sender, said impulser being capable of producing a series oi time-spaced impulses, each of said series of impulses representing a digit, and a register having a digit registering capacity of less than the total number of digits in the designation of both said calling line and said called line, said register being operable by said time-spaced impulses to register in succession the digits of said called line designation and the digits of said calling line designation.

9. In a telephone system, in combination with a plurality of lines and a called line, each of said lines having an individual designation composed of digits, an impulser producing time-spaced impulses, a plurality of groups of connections between the said line and said impulser, each of said groups of connections being individual to one of said lines and arranged to express the individual designation thereof, a sender, connections between said impulser and said sender, means responsive to one of said lines when calling said called line, means responsive to said last-mentioned means for registering the designation of said called line in said sender, and a register having a digital registering capacity of less than the total number of digits in b-oth the designation of one of said calling lines and said called line, said register being repetitively operable by said time-spaced impulses under the control of said sender to register said called line designation over said connections between said sender and said impulser, and to register said calling line designation over the group of connections between said calling line and said impulser.

RALPH E. HERSEY.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 2,112,951 Carpenter Mar. 5, 1938 2,165,924 Goodrum July 11, 1939 2,270,246 Bascom Jan. 20, 1942 2,273,165 Wright Feb. 17, 1942 2,294,870 Holden et al June 2, 1942 2,351,551 Seibel June 13, 1944 2,369,071 Ostline Feb. 6, 1945 

